Firefox, ancora problemi

firefox insiste ancora con questo errore:

bad request

your browser sent a request that this server could not understand.
size of a request header field exceeds server limit.

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apache/2.2.3 (debian) php/4.4.4-8+etch4 server at default port 80

negli ultimi giorni devo svuotare la cache e i coockie almeno una volta al giorno, ma da oggi non funziona nemmeno svuotando, infatti mi tocca entrare con ie, c'è una soluzione valida?